This one-time health resort was used by aristocrats around the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

A whimsical bridge adorned with decorative dragons.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A hands-off space for graffiti artists to hone and display their skills.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This huge work of functional public art replaced a landfill in New Jersey's Meadowlands.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

This once luxurious Catskills resort is now a haunting ruin.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Avoid gangster interaction while window-shopping.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.